<template>
  <div>
    <table border="1" width="700" style="border-collapse: collapse">
      <caption>
        购物车
      </caption>
      <thead>
        <tr>
          <th><input v-model="isAll" type="checkbox" /> <span>全选</span></th>
          <th>名称</th>
          <th>价格</th>
          <th>数量</th>
          <th>总价</th>
          <th>操作</th>
        </tr>
      </thead>
      <tbody>
        <shopp-cart
          v-for="(item, index) in goodList"
          :item="item"
          :index="index"
          @minus="minus"
          @add="add"
          @del="del"
        />
      </tbody>
      <tfoot>
        <tr>
          <td>合计:</td>
          <td colspan="5">
            {{ sum }}
          </td>
        </tr>
      </tfoot>
    </table>
  </div>
</template>

<script>
import ShoppCart from "components/shoppCart/ShoppCart";

export default {
  data() {
    return {
      goodList: [
        {
          name: "诸葛亮",
          price: 1000,
          num: 1,
          checked: false,
        },
        {
          name: "蔡文姬",
          price: 1500,
          num: 1,
          checked: false,
        },
        {
          name: "妲己",
          price: 2000,
          num: 1,
          checked: false,
        },
        {
          name: "鲁班",
          price: 2200,
          num: 1,
          checked: false,
        },
      ],
    };
  },
  components: {
    ShoppCart,
  },
  computed: {
    sum() {
      return this.goodList.reduce(
        (old, item) => (old += item.checked ? item.price * item.num : 0),
        0
      );
    },
    isAll: {
      set(val) {
        this.goodList.filter((item) => (item.checked = val));
      },
      get() {
        return this.goodList.every((item) => item.checked);
      },
    },
  },
  methods: {
    minus(index) {
      if (this.goodList[index].num <= 1) {
        this.goodList[index].num = 1;
        return this.$prompt.show('不能小于1哦！')
      }
      this.goodList[index].num--;
    },
    add(index) {
      this.goodList[index].num++;
    },
    del(index) {
      this.goodList.splice(index, 1);
      this.$prompt.show("删除成功！");
    },
  },
};
</script>

<style>
</style>